A method for modifying a separable projectile between a test embodiment or an effect embodiment includes detaching the front projectile body from the rear projectile body, arranging a payload container in the front projectile body where the payload container comprises measuring equipment or an effect part, and fitting the front projectile body to the rear projectile body by way of a belt. A separable projectile which can be modified between a test embodiment and an effect embodiment is also provided.

A system operative to down a target drone having propellers deployed along a perimeter p, comprising a processor-controlled interceptor drone bearing a processor-controlled flexible elongate intercepting agent cannon and an onboard camera; and an onboard processor to receive sensed wind conditions and to a firing distance d, between interceptor and target drones, given a firing angle A, and wherein the processor is configured to track the target drone using imagery generated by the onboard camera including at least once, when said wind conditions exist, guiding the interceptor drone to a firing position whose distance from the target drone is d, and commanding the cannon to fire at firing angle A, once said firing position is achieved, thereby to use the flexible elongate intercepting agent to down target drones.

A system operative to down a target drone having propellers deployed along a perimeter p, comprising a processor-controlled interceptor drone bearing a processor-controlled flexible elongate intercepting agent cannon and an onboard camera; and an onboard processor to receive sensed wind conditions and to a firing distance d, between interceptor and target drones, given a firing angle A, and wherein the processor is configured to track the target drone using imagery generated by the onboard camera including at least once, when said wind conditions exist, guiding the interceptor drone to a firing position whose distance from the target drone is d, and commanding the cannon to fire at firing angle A, once said firing position is achieved, thereby to use the flexible elongate intercepting agent to down target drones.

A crowd control projectile includes a payload carrier, an incapacitating agent inside the payload carrier, and an activating mechanism for activating the incapacitating agent. The activating mechanism includes a sensor and a timer. The timer delays the activation until a predetermined delay after the sensor senses that the projectile has been launched. Alternatively, the activating mechanism includes a receiver for receiving an activation signal after the projectile has been launched. Preferably, the projectile has the shape of a clay pigeon. A launcher of such a projectile includes a communication mechanism for transmitting a timing signal or an activation signal to the projectile and an arm for launching the projectile by direct contact. To control a crowd, the projectile is launched over the crowd by direct contact with a solid arm and the activating mechanism is used to activate the incapacitating agent when the projectile is above the crowd.

A crowd control projectile includes a payload carrier, an incapacitating agent inside the payload carrier, and an activating mechanism for activating the incapacitating agent. The activating mechanism includes a sensor and a timer. The timer delays the activation until a predetermined delay after the sensor senses that the projectile has been launched. Alternatively, the activating mechanism includes a receiver for receiving an activation signal after the projectile has been launched. Preferably, the projectile has the shape of a clay pigeon. A launcher of such a projectile includes a communication mechanism for transmitting a timing signal or an activation signal to the projectile and an arm for launching the projectile by direct contact. To control a crowd, the projectile is launched over the crowd by direct contact with a solid arm and the activating mechanism is used to activate the incapacitating agent when the projectile is above the crowd.

A ball joint gimbal (BJG) seeker assembly is provided and includes a back shell, a retaining system disposed to urge the seeker ball toward the back shell and a piezoelectric ultrasonic motor and sensor system arrayed between the seeker ball and the back shell. The piezoelectric ultrasonic motor and sensor system is pre-loaded by the retaining system and configured to controllably drive an angular orientation of the seeker ball.

The system and method for accurately determining range-to-go for a time-delayed command detonation of a projectile. Using dual laser and/or radio frequency detectors on the tail and on the nose of a spinning projectile to determine the range-to-go, time-to-go, and/or lateral offset from the projectile to the target. A time to detonation clock is used to determine when a projectile transitions from an exterior to an interior of a structure such that the projectile can more accurately detonate within a fixed structure.

One aspect of the invention relates to chemiluminescent compositions comprising an oxalate composition, an activator composition and a H.sub.2O.sub.2-decomposition catalyst. Another aspect of the invention relates to chemiluminescent compositions comprising an oxalate composition, an activator composition and a peroxyoxalate catalyst. Another aspect of the invention relates to chemiluminescent systems comprising a chemiluminescent composition disclosed herein, wherein the oxalate composition and the activator composition are stored separately until activation. Another aspect of the invention relates to chemiluminescent systems comprising a chemiluminescent composition disclosed herein, wherein the oxalate composition, the activator composition, the peroxyoxalate catalyst, and/or the H.sub.2O.sub.2-decomposition catalyst are stored separately until activation. Another aspect of the invention relates to methods for initiating the chemiluminescent compositions and/or the chemiluminescent systems disclosed herein.

One aspect of the invention relates to chemiluminescent compositions comprising an oxalate composition, an activator composition and a H.sub.2O.sub.2-decomposition catalyst. Another aspect of the invention relates to chemiluminescent compositions comprising an oxalate composition, an activator composition and a peroxyoxalate catalyst. Another aspect of the invention relates to chemiluminescent systems comprising a chemiluminescent composition disclosed herein, wherein the oxalate composition and the activator composition are stored separately until activation. Another aspect of the invention relates to chemiluminescent systems comprising a chemiluminescent composition disclosed herein, wherein the oxalate composition, the activator composition, the peroxyoxalate catalyst, and/or the H.sub.2O.sub.2-decomposition catalyst are stored separately until activation. Another aspect of the invention relates to methods for initiating the chemiluminescent compositions and/or the chemiluminescent systems disclosed herein.

The present invention provides a projectile for use in a simulated fan-blade-off ballistic test. The projectile has an ellipsoid body having a blind axial bore extending from a first axial end. The blind axial bore is for housing a weight adjustment body which can be used to modify the weight and/or centre of gravity of the projectile. A sealing plug may seal the weight adjustment body within the axial bore and an insert may be provided to fix the position of the weight adjustment body and/or to control the sliding of the weight adjustment body within the axial bore.